Convar

sm_anti_private_inventory Whether or not to check for private inventory (0 - Disable Inventory Checking, 1 - Enable Inventory Checking) [Default: 1.0] (Min: 0.0) (Max: 1.0)
sm_anti_private_deal_method Method of action when private profile/inventory has been detected (1 - Kick, 2 - Warn) [Default: 1.0] (Min: 1.0) (Max: 2.0)
sm_anti_private_fail_method Method of action when the plugin fails to fetch result (1 - Nothing, 2 - Kick) [Default: 1.0] (Min: 1.0) (Max: 2.0)
sm_anti_private_log Whether or not to log HTTP requests to file (0 - Disable logging, 1 - Enable logging) [Default: 1.0] (Min: 0.0) (Max: 1.0)
sm_anti_private_key Steam Developer API Key; Required for this plugin to work

Prerequisites

Extract Anti_Private.smx to /addons/sourcemod/plugins
Extract anti_private.phrases.txt to /addons/sourcemod/translations
Load the plugin (sm plugins load Anti_Private), change the map, OR restart the server
Edit /cfg/sourcemod/anti_private.cfg
- Update sm_anti_private_key with value obtained from https://steamcommunity.com/dev/apikey
Reload the plugin (sm plugins reload Anti_Private), change the map, OR restart the server

Profiles that aren't configured are also blocked
Friends-only will be considered private as long as the owner of the API key is not friend with that individual
Steam takes account of owner's relation to their API
With high traffic servers, you may exceed Steam's API rate limit
Since this plugin depends on Steam, during Steam maintenance/outage (Tuesday), this plugin may not work

If you wish to contribute to the phrases file, please fork this repository and open a pull request